Territory



A.. OLSEN. LIFTING TRUSS GIRDBR.

' 110.414,848. Patented Nov. 12, 1888.

N. PETERS, Phatfljuwgnphnr. Withington. D C.

NITE

ANDREAS OLSEN, OF EFHRAIM, UTAH TERRITORY, ASSIGNOR OF ONE-THIRD TO JAMES O. PETERSON, OF SAME PLACE.

L IFTNG TRUSS-GIRDER.

SPECIFICATION forming part of Letters Patent No. 414,843, dated November 12, 1889.

Application tiled July 1Q, 1889. Serial No. 317,072@ (No model.)

To @Z whom it may concern: the screws the latter may be rotated in such Be it known that I, ANDREAS OLsEN, of manner as to cause the bifurcated portions 55 Ephraim, in the count-y of San Pete, Terriof the turn-buckles to be moved nearer to or tory of Utah, have invented a certain new farther from each other. 'By varying the ad- 5 and useful Improvement in Lifting Trussjustment of the turn-buckles thus made Girders, of which the following is a speciiicapossible the stretchers A A may be moved tion. nearer to or farther from each other, and may 6o I will describe my improvement in detail, be bowed or curved to any desired extent in and then point out the novel features in the same general direction. 1J claims. When the screws are manipulated so as to In the accompanying drawings, Figure l bow the upper stretcher, the lower stretcher, is a side velevation of a truss-girder embodyowing to the reverse screw -threads of the 65 ing my improvement. Fig. 2 is a'vertical screws andthe links B,will follow the former section thereof, taken on the line .fr Qc, Fig. 1. into any position into which it may be ad- 15 Fig. 3 is a vertical section thereof, taken on j Listed.

the line y y, Fig. l. By my improvement it is made possible to Similar-letters of reference designate correraise tioors, ship-decks, or anything of a simi- 7o spending parts in all the igures. larnature which through sagging has dropped A designate stretchers, which extend below its proper level at or near its middle.

zo horizontally, and are preferably made ot' Of course it is to be understood that in 1netal-such, for instance, as steel or iron. order to cause the bowing or curving of the B designates links extending between the stretchers the manipulation of the turn` 75 stretchers A A', and pivotally connected buckles is to be varied from about midway thereto, as here shown by means of pivots a. of the lengths of the stretchers outwardly to- 2 5 I have shown bolts Z connecting the links B. ward their ends, the greatest expansion of O designates turn-buckles. These turnthe turn-buckles being of course nearer the buckles have bifurcated portions, as shown ends of the st-retchers. 8o more clearly in Figs. 2 and 3, which portions During the manipulation of my improved are embraced between opposite ends of adtruss-girder the same may be secured near 3o jacent links B at the points of connection beits ends to any suitable supports, and in fact, tween the latter and the stretcher A A', and after its proper manipulation, the same may which embrace the stretchers A A. The be left thus secured in order to uphold in 8: turn-buckles therefore extend obliquely beproper position the flooring or whatever else tween the stretchers. The pivots ct extend, it may be applied to.

3 5 not only through the end portions lof the links That I claim as my invention, and desire to B and through the stretchers A A', but also secure by Letters Patent, is- K through the biturcated portions of the turnl. A lifting truss girder comprising two 9o buckles O, as shown more clearly in Fig. 2.- stretchers, links pivotally connected to said The turn-buckles upon one portion ot the stretchers, and turn-buckles extending be- 40 truss-girder extend in opposite directions to tween said stretchers and pivotally connected those upon the other portion. By the means thereto, substantially as and for the purpose described it will be seen vthat the turn-buckles specified. 9 5 and the links are free to move independently 2. A lifting truss-girder comprising two of each other upon the pivots a. stretchers, links extending between the same 45 rOomprised in the turn-buckles O are screws pivotally connected thereto, turn-buckles pivhaving portions c c, and intermediate of the otally connected to the stretchers and extendportions c c of the screws are formed or coming in reverse directions, said turn-buckles roo bined therewith hand-pieces b, here shown comprising screws provided with reverse as octagonal. The screw-threads upon the screw-threads, substantially as specified.

5o portions co of the screws extend in reverse ANDREAS OLSEN.

directions and engage screw-threaded aper- 'Vitnesses: tures in the bifurcated portions of the turn- ANDREW MORTENSON, buckles. By grasping the hand-pieces b on CHARLES VHITLOCK. 

